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cook: prevent div-by-zero if channels is zero. 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit 941fc1ea1e)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Ronald S. Bultje 2012-02-17 12:10:33 -08:00 committed by Reinhard Tartler
parent 0fe5321634
commit d031302e0e
1 changed files with 4 additions and 0 deletions
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4
libavcodec/cook.c
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@ -1066,6 +1066,10 @@ static av_cold int cook_decode_init(AVCodecContext *avctx)
q->sample_rate = avctx->sample_rate;
q->nb_channels = avctx->channels;
q->bit_rate = avctx->bit_rate;
if (!q->nb_channels) {
av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
return AVERROR_INVALIDDATA;
}
/* Initialize RNG. */
av_lfg_init(&q->random_state, 0);